55 lines
1.6 KiB
Plaintext
Executable File
55 lines
1.6 KiB
Plaintext
Executable File
// This file is part of www.nand2tetris.org
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// and the book "The Elements of Computing Systems"
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// by Nisan and Schocken, MIT Press.
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// File name: projects/3/a/RAM64.hdl
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/**
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* Memory of sixty four 16-bit registers.
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* If load is asserted, the value of the register selected by
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* address is set to in; Otherwise, the value does not change.
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* The value of the selected register is emitted by out.
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*/
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CHIP RAM64 {
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IN in[16], load, address[6];
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OUT out[16];
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PARTS:
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// Figuring out which RAM8 to write to
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DMux8Way(
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in=load,
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sel=address[3..5],
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a=load01,
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b=load02,
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c=load03,
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d=load04,
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e=load05,
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f=load06,
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g=load07,
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h=load08
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);
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// Writing the correct RAM address inside the register
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RAM8(in=in, load=load01, address=address[0..2],out=ram8out01 );
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RAM8(in=in, load=load02, address=address[0..2],out=ram8out02 );
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RAM8(in=in, load=load03, address=address[0..2],out=ram8out03 );
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RAM8(in=in, load=load04, address=address[0..2],out=ram8out04 );
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RAM8(in=in, load=load05, address=address[0..2],out=ram8out05 );
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RAM8(in=in, load=load06, address=address[0..2],out=ram8out06 );
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RAM8(in=in, load=load07, address=address[0..2],out=ram8out07 );
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RAM8(in=in, load=load08, address=address[0..2],out=ram8out08 );
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// Reading the selected RAM Register
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Mux8Way16(
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a=ram8out01,
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b=ram8out02,
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c=ram8out03,
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d=ram8out04,
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e=ram8out05,
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f=ram8out06,
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g=ram8out07,
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h=ram8out08,
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sel=address[3..5],
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out=out
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);
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} |